I run Pathfinder and large portion of the time I’m pulling my enemies straight from their stat blocks online. By using the Copy As Markdown extension in Chrome or Firefox, I can get a nicely-formatted copy of that stat block. On Astral, I can paste it into the Character Notes section and that’s pretty usable, but that isn’t really the purpose of Character Notes - it closes every time you click away from it and it’s an extra click to launch it every time you open the character. I would love to see the ability to just use the Markdown editor from the Character Notes section to directly display a Markdown block in lieu of an uploaded character sheet.
I believe that it has been discussed when the conversation about setting text blocks came up. Very kewl use of the idea.